CN211585956U

CN211585956U - Deoxidation reaction tower for desulfurization tail gas

Info

Publication number: CN211585956U
Application number: CN201922172289.6U
Authority: CN
Inventors: 曲斌; 段有龙; 于涛
Original assignee: Acre Coking and Refractory Engineering Consulting Corp MCC
Current assignee: Acre Coking and Refractory Engineering Consulting Corp MCC
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2020-09-29
Anticipated expiration: 2029-12-06

Abstract

The utility model relates to a desulfurization tail gas's deoxidation reaction tower, including base, low head, urceolus, outer conic section, inner tube, tube sheet, reaction cylinder, interior conic section, flange, circulation liquid outlet pipe, knockout drum, tail gas outlet pipe and Na₂SO₃And (4) a solution spray pipe. The beneficial effects are as follows: dividing the regenerated tail gas into a plurality of parts by utilizing reaction cylinders, spraying sodium sulfite solution to each reaction cylinder by adopting a spray pipe to collide with the tail gas, and independently carrying out deoxidation reaction treatment, wherein each reaction cylinderThe foam area of abundant contact mixture is formed in the individual reaction cylinder to accelerate the reaction of sodium sulfite and oxygen, can effectively detach the oxygen in the negative pressure desulfurization tail gas, the deoxidation efficiency is high, simple structure, convenient operation.

Description

Deoxidation reaction tower for desulfurization tail gas

Technical Field

The utility model relates to a desulfurization tail gas treatment technical field in the coking production especially relates to a desulfurization tail gas's deoxidation reaction tower.

Background

In the process of gas purification production in China, most coking plants adopt an HPF method desulfurization process and then connect with a saturator ammonium sulfate process. Because the desulfurization and ammonium sulfate processes are both arranged behind the blower, the phenomenon of unreasonable temperature gradient of coal gas exists, and the energy consumption is increased. The problem can be solved by an oxidation process of gas desulfurization with ammonia as an alkali source under negative pressure and a spray saturator ammonium sulfate process arranged behind an air blower. The regenerated tail gas after negative pressure desulfurization contains ammonia, and the regenerated tail gas is sent back to a gas system to recover the ammonia, so that the direct discharge pollution to the environment can be avoided. However, the negative pressure desulfurization inevitably causes the regeneration tail gas to contain oxygen, and the oxygen content in the coal gas system is required to be not more than 2 percent, otherwise, the explosion is easy to generate. Therefore, the oxygen contained in the negative-pressure desulfurization tail gas becomes a problem to be solved urgently for the safe and stable operation of a gas purification system.

SUMMERY OF THE UTILITY MODEL

For overcoming the prior art defect, the utility model provides a technical problem provides a desulfurization tail gas's deoxidation reaction tower utilizes the reaction cylinder to divide into a plurality of parts with regeneration tail gas, adopts the spray tube to spray sodium sulfite solution to each reaction cylinder and tail gas clash, carries out deoxidation reaction treatment alone, forms the foam district that the intensive contact mixes in each reaction cylinder to sodium sulfite and oxygen's reaction with higher speed, can effectively detach the oxygen in the negative pressure desulfurization tail gas, and the deoxidation is efficient, moreover, the steam generator is simple in structure, and convenient operation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a deoxidation reaction tower for desulfurization tail gas comprises a base, a lower end enclosure, an outer cylinder, an outer conical section, an inner cylinder, a tube plate, a reaction cylinder, an inner conical section, a flange, a circulating liquid outlet pipe, a separation cylinder, a tail gas outlet pipe and Na₂SO₃The solution spray pipe is characterized in that the base, the lower end enclosure, the outer barrel and the outer conical section are sequentially connected to form an equipment shell, the tail gas outlet pipe is arranged at the upper end of the side wall of the outer barrel and communicated with the outer barrel, and the bottom of the lower end enclosure is provided with a circulating liquid outlet pipe; the inner cylinder is inserted into the equipment shell, and the outer wall of the inner cylinder is fixedly connected with the outer conical section; the reaction cylinders are uniformly distributed and insertedIn the inner cylinder, the upper end of the inner cylinder penetrates through the tube plate and is fixedly connected with the inner cylinder through the tube plate, and Na is arranged in each reaction cylinder₂SO₃A solution spray pipe; the large end of the inner conical section is fixedly connected with the inner cylinder, and the small end of the inner conical section is connected with the flange; the separating cylinder is arranged at the joint of the outer cylinder and the tail gas outlet pipe.

The height of the reaction cylinder is 30-50 mm less than that of the inner cylinder, and the cross section of the reaction cylinder can be one or a combination of a circle, a regular quadrangle and a regular hexagon.

The separating cylinder comprises a straight cylinder and an expanded arc-shaped cylinder, wherein the outer diameter of the straight cylinder is 20-30 mm smaller than the inner diameter of the tail gas outlet pipe, and supporting plates are arranged between the separating cylinder and the tail gas outlet pipe and between the separating cylinder and the outer cylinder for supporting.

The outer diameter of the inner cylinder is 100-200 mm smaller than the inner diameter of the outer cylinder.

Further, the tail gas outlet pipe is composed of a horizontal pipe, a 90-degree elbow and a vertical pipe, and the outlet is upward.

Further, said Na₂SO₃The solution spray pipe is a straight spray pipe and can be made of a steel pipe with variable diameters.

A working method of a desulfurization tail gas deoxygenation reaction tower comprises the following steps:

1) desulfurization regeneration tail gas enters from the flange, uniformly distributed through the inner cone section and then enters each reaction cylinder;

2) in the reaction cylinder, desulfurizing and regenerating tail gas and Na₂SO₃Na sprayed by solution spray pipe and moving upwards in countercurrent₂SO₃The solutions collide to form a well-mixed, high-speed mixing foam zone for Na₂SO₃The solution is fully contacted with oxygen in the regeneration tail gas and reacts to generate Na₂SO₄The solution flows to the bottom of the outer cylinder along the tail gas under the action of gravity;

3) after the deoxygenation, part of liquid carried by the tail gas flows out of the reaction cylinder and the inner cylinder, then upwards passes through the separation cylinder and enters the elbow of the tail gas outlet pipe, the tail gas impacts the pipe wall at the elbow and is separated from the liquid under the action of gravity, and the separated liquid flows back to flow into the bottom of the outer cylinder from a gap between the separation cylinder and the straight pipe section of the tail gas outlet pipe;

4) the separation cylinder blocks the return liquid separated by directly blowing the tail gas, so that the separated return liquid can be prevented from being carried by the deoxidized tail gas for the second time;

5) na in the bottom of the outer tub₂SO₄The solution is discharged from the circulating liquid outlet pipe.

Compared with the prior art, the beneficial effects of the utility model are that:

1) through Na₂SO₃Na sprayed from solution spray pipe₂SO₃The solution is in countercurrent contact with the desulfurization regeneration tail gas in the reaction cylinder, collision impact occurs, a high-speed turbulent mixing zone is formed, the gas-liquid contact area is enlarged, the reaction effect is enhanced, and the deoxidation efficiency is improved;

2)Na₂SO₃the solution spray pipe adopts a macroporous nozzle of a straight spray pipe, the solution does not need to be atomized, and the large-particle liquid drops are contacted with tail gas, so that the power consumption of the nozzle is reduced;

3) the reaction cylinder divides the desulfurization regeneration tail gas into a plurality of parts, and the desulfurization reaction treatment is independently carried out, so that the deoxidation efficiency is high;

4) the separating cylinder protects the separated liquid from being blown away and prevents the separated liquid from being carried by the tail gas for the second time.

Drawings

FIG. 1 is a schematic view of the technical structure of the present invention;

FIG. 2 is a schematic view of the cross-section A-A of FIG. 1 (with the equipment enclosure removed);

fig. 3 is a schematic diagram of an enlarged structure of a portion I in fig. 1.

In the figure: 1-flange 2-inner cone section 3-inner cylinder 4-outer cone section 5-outer cylinder 6-lower end socket 7-base 8-circulating liquid outlet pipe 9-separating cylinder 10-tail gas outlet pipe 11-reaction cylinder 12-pipe plate 13-Na₂SO₃Solution nozzle 14-support plate

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:

as shown in the figures 1-3, the utility model relates to a tower for deoxidation reaction of desulfurization tail gas, which comprises a base 7, a lower end socket 6, an outer cylinder 5, an outer cone section 4, an inner cylinder 3, a tube plate 12,Reaction cylinder 11, inner cone section 2, flange 1, circulating liquid outlet pipe 8, separation cylinder 9, tail gas outlet pipe 10 and Na₂SO₃The device comprises a solution spray pipe 13, a base 7, a lower end enclosure 6, an outer cylinder 5 and an outer conical section 4 which are sequentially connected to form a device shell, a tail gas outlet pipe 10 is arranged at the upper end of the side wall of the outer cylinder 5 and communicated with the outer cylinder 5, and a circulating liquid outlet pipe 8 is arranged at the bottom of the lower end enclosure 6; the inner cylinder 3 is inserted into the equipment shell, and the outer wall of the inner cylinder 3 is fixedly connected with the outer conical section 4; the reaction barrels 11 are uniformly distributed and inserted in the inner barrel 3, the upper ends of the reaction barrels penetrate through the tube plate 12 and are fixedly connected with the inner barrel 3 through the tube plate 12, Na is arranged in each reaction barrel 11₂SO₃A solution nozzle 13; the large end of the inner conical section 2 is fixedly connected with the inner cylinder 3, and the small end is connected with the flange 1; the separation cylinder 9 is arranged at the joint of the outer cylinder 5 and the tail gas outlet pipe 10.

The height of the reaction cylinder 11 is 30-50 mm less than that of the inner cylinder 3, and the section of the reaction cylinder can be one or a combination of a circle, a regular quadrangle and a regular hexagon (see figure 2). The desulfurization regeneration tail gas is divided into a plurality of parts by the reaction cylinders 11, and the deoxidation reaction treatment is independently carried out, so that the deoxidation efficiency is high.

The separating cylinder 9 consists of a straight cylinder and an expanded arc-shaped cylinder, wherein the outer diameter of the straight cylinder is 20-30 mm smaller than the inner diameter of the tail gas outlet pipe 10, and supporting plates 14 are arranged between the separating cylinder 9 and the tail gas outlet pipe 10 and between the separating cylinder 9 and the outer cylinder 5 for supporting, connecting and reinforcing (see fig. 3).

The outer diameter of the inner cylinder 3 is 100-200 mm smaller than the inner diameter of the outer cylinder 5.

Further, the tail gas outlet pipe 10 is composed of a horizontal pipe, a 90-degree elbow and a vertical pipe, and the outlet is upward.

Further, said Na₂SO₃The solution spray pipe 13 is a straight spray pipe and can be made of a steel pipe with variable diameters.

1) the desulfurization regeneration tail gas enters from the flange 1, uniformly distributed through the inner cone section 2 and then enters each reaction cylinder 11;

2) in the reaction cylinder 11, the tail gas of the desulfurization regeneration is mixed with Na₂SO₃Sprayed by solution nozzles 13Na upstream of the counterflow₂SO₃The solutions collide to form a well-mixed, high-speed mixing foam zone for Na₂SO₃The solution is fully contacted with oxygen in the regeneration tail gas and reacts to generate Na₂SO₄The solution flows to the bottom of the outer cylinder 5 along the tail gas under the action of gravity;

3) after the deoxygenation, part of liquid carried by the tail gas flows out of the reaction cylinder 11 and the inner cylinder 3, returns upwards to pass through the separation cylinder 9 and enters the elbow of the tail gas outlet pipe 10, the tail gas impacts the pipe wall at the elbow and is separated from the liquid under the action of gravity, and the separated liquid flows back to flow into the bottom of the outer cylinder 5 from a gap between the separation cylinder 9 and the straight pipe section of the tail gas outlet pipe 10;

4) the separation cylinder 9 blocks the return liquid separated by directly blowing the tail gas, so that the separated return liquid can be prevented from being carried by the deoxidized tail gas for the second time;

5) na in the bottom of the outer cylinder 5₂SO₄The solution is discharged from the circulation liquid outlet pipe 8.

Claims

1. A deoxidation reaction tower for desulfurization tail gas comprises a base, a lower end enclosure, an outer cylinder, an outer conical section, an inner cylinder, a tube plate, a reaction cylinder, an inner conical section, a flange, a circulating liquid outlet pipe, a separation cylinder, a tail gas outlet pipe and Na₂SO₃The solution spray pipe is characterized in that the base, the lower end enclosure, the outer barrel and the outer conical section are sequentially connected to form an equipment shell, the tail gas outlet pipe is arranged at the upper end of the side wall of the outer barrel and communicated with the outer barrel, and the bottom of the lower end enclosure is provided with a circulating liquid outlet pipe; the inner cylinder is inserted into the equipment shell, and the outer wall of the inner cylinder is fixedly connected with the outer conical section; the reaction barrels are uniformly distributed and inserted in the inner barrel, the upper ends of the reaction barrels penetrate through the tube plate and are fixedly connected with the inner barrel through the tube plate, and Na is arranged in each reaction barrel₂SO₃A solution spray pipe; the large end of the inner conical section is fixedly connected with the inner cylinder, and the small end of the inner conical section is connected with the flange; the separating cylinder is arranged at the joint of the outer cylinder and the tail gas outlet pipe.

2. The tower of claim 1, wherein the height of the reaction cylinder is 30 to 50mm less than the height of the inner cylinder, and the cross section of the reaction cylinder may be one or a combination of a circle, a square, and a hexagon.

3. The tower of claim 1, wherein the separation cylinder comprises a straight cylinder and an enlarged arc cylinder, wherein the outer diameter of the straight cylinder is 20-30 mm smaller than the inner diameter of the tail gas outlet pipe, and support plates are disposed between the separation cylinder and the tail gas outlet pipe and between the separation cylinder and the outer cylinder.

4. The tower of claim 1, wherein the outer diameter of the inner cylinder is 100 to 200mm smaller than the inner diameter of the outer cylinder.

5. The tower of claim 1, wherein the tail gas outlet pipe comprises a horizontal pipe, a 90 ° elbow, and a vertical pipe.